Correct the single error in each of the following sentences, choose the correct answer to complete a sentence, give the correct form of a word, and provide an antonym.

Here are the answers to your questions:

4.1.1 Correct the SINGLE error in each of the following sentences:

• a. It's (Correction: "Its" should be "It's" as a contraction of "It is".)
• b. They (Correction: "they" should be capitalized as it starts a sentence.)
• c. tells (Correction: "tell" should be "tells" to agree with the singular subject "This book".)
• d. on (Correction: "of" should be "on" when referring to an impression made.)

4.1.2 Choose the correct answer to complete the following sentence: It's a collection of stories from current and former school children. The subject of this sentence is:

• a. A collection (The pronoun "It" refers to "A collection" in this context.)

4.1.3 Give the correct form of the word in brackets: This book is about the [celebrate] of heroes and heroines' commitment

• celebration (The noun form of "celebrate" is required here.)

4.1.4 Write down an antonym for the underlined word in the following sentence:

• The sentence and the underlined word are not provided in the image.